Yup, my thoughts as well
Maybe he doesn't want to scare the uke more if he kill those gang and make uke hate him ╮(￣▽￣)╭
He is an imoogi with a mission to find his cintamani (fated love).
If an imoogi in a mission to turn into a dragon kill a human "directly", they will turn into Gangcheori (evil imoogi) and will never be able to ascend to the heaven.
Thank you for this explanation! I genuinely was so confused on why he wasn’t just straight up killing the bad guys
but why cant he just kill those bastards then? why make someone else do the work??? （￣へ￣）